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The annual total exceeded 500 in only seven years and it has fluctuated during the last 20 years. There are few colonies where they may safely be ringed; elsewhere disturbance may cause severe losses of eggs and young showered from the ledges by startled adults. Apart from the few safe colonies most ringing is now done by professional biologists undertaking special studies. As with the Razorbill, about two nestlings are ringed for every full-grown bird.Lundy (16.7%). Almost all from 1948-1957. Pembroke Colonies (9.3%). Since 1933 but interrupted by the War.Great Saltee (8.1%). All but seven of the recoveries were of 1966 pulli.

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